How do the gps and gis technologies used in portland, oregon, improve public transportation in that city

The development of GPS and GIs technology helped the public transportation system in two ways:
- First, it is easier for both drivers or passengers to locate the place that unfamiliar to them, which will reduce the cost and the time for travel.
- Second, the technologies could be used to detect traffics so the drivers could choose pathway options that would save them from the traffic.

A,b,c is the answer to the question